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https://issues.apache.org/jira/browse/GUACAMOLE-2081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18018895#comment-18018895
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David S. Jones commented on GUACAMOLE-2081:
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see my comment in GUACAMOLE-2118
> "nop" ping inexplicably stops, resulting in connection timeout
> --------------------------------------------------------------
>
> Key: GUACAMOLE-2081
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-2081
> Project: Guacamole
> Issue Type: Bug
> Components: libguac
> Affects Versions: 1.6.0
> Reporter: Mike Jumper
> Priority: Blocker
>
> For currently unknown reasons, the {{nop}} instruction sent by guacd to keep
> the connection alive appears to cease happening while connections are
> ongoing. This results in the client giving up and closing the connection
> under the assumption that the server has stopped responding.
> *NOTE:* The {{nop}} keep-alive ping sent by guacd (via libguac) is normally
> expected roughly every 5 seconds, and is supposed to only _not_ be sent if
> other instructions have been sent along the same {{guac_socket}} in the last
> 5 seconds.
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